the underlying technology (aka fundamentals) is completely useless, price is completely based on hype and people who buy because of FOMO.
I'm not saying you can't make money off of it but one day it will drop hard and won't recover.
People love BTC for that very reason; it is nothing. Money, gold, stocks, real estate, etc. can all be taken from you at a whim.
Bitcoin pretty much exists only in your head and the keys are stored there. One of the few places you can park money outside of the sphere of government control.
Couple that with the fact that we're moving towards 100% internet money anyways very soon, BTC could become the new alternative to physical cash, except you earn interest on it because there is a limited amount. If people decide it so, this thing will be around in 50 years.